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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f90d2c106c2c476ef134794e3a0e574139807cc9a2e092f4af8696cca38d7d' 
  AND token = 'PGddZqhAFnk8gY7K+P0k3kO5F7oiT9EIo9CdB8I7uI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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