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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc50e82fadfc94bc52ccd29c0eeadcd70f85ac8aeb2776abe14a2c8dd3be5348' 
  AND token = 'G7b+F5AuUdWzxqREjc5Ln/m2ljnUDzuz1CakdtjXRLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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