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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecad7cf4bd539953b7875465fedfb89d15a7bce71cd54242d8c4ca19b82f93a' 
  AND token = 'rptuP+j9iGirbR0pDyotrZ3vGhHHCu1KWdv5mogKjNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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