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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ddd19bb9224c2bcf2dba649122d5a98900dc1a93602492a2ee897c2f4c74af' 
  AND token = 'QHeoygBjDRl45zV3w98KKRwB5Lnz9CkN1p2HfQr8BFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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