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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962e0550892ab0b61d61b4e1346570fe203f176ec1e342063a47eb2a70512743' 
  AND token = 'Ik9R6oC96dwWWcGcddjYgJvPP+yWyCnyIWXRK+o+OIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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