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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a862d024d94e7c417a90a1951e793736787b53c0d4f8e7512c3b09361d4cc9' 
  AND token = 'c7zEL2WI1txgm2fD5vhwlhDfxlwWCyl2iN1op+Ok7rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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