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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ee412c0c7de2857867fe689294ced4066dc118de88e8696a8a99ca3463b19b' 
  AND token = 'U+BbIOjjYNb9kTMr32ysRQddKfZYOntFBw0Vwb3B3Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}