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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0bb271a818af5cff320bd762a8ee35f7177f0b907fe195423045f29cef6a07' 
  AND token = 'zCIJ2/iXQD+2P5Ijjd3U7OwxiMBjxqWSiYs/r6WFCHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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