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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3da8c843d1c147274b585234c2af7f8e1870de85a847e51059c59bbb45ffa7a' 
  AND token = 'gyCSl9q3BlVx0yXD6o0gCGnCJDNzI15DRyAUQO8zEvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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