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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e960a9185bd2572bfdb8d1e2a53b0461a1ef722240714ef74fe103c69038bcb7' 
  AND token = 'A9s9qkm2i85s2DDBC6JhfbeChsyedI6m0RA03AwfxtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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