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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096f095e2e29234182cc42234dd43aace4712c10ad91f2d26ab2f1091d1ded54' 
  AND token = '8NeKGEge+/mqgRDq2QwI6bCKnActBiRgH9WlhqguEYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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