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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1989caaa0a6d5f40a94c6fd8e2de593ef3502094f18dafdcdff67a8f70d3125d' 
  AND token = 'I1JTKm7RK3tDXLtw1gdruHXgKsGoKBR4ovS5C73OsBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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