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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be29e6f000f9327673642398b9d1d951648c24fc124d1d73ece84dbd00d04d15' 
  AND token = 'v8vZSEgJjDH20MFN4pL9BiXnw4iolS0j9cp/ly3JCv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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