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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683f0f1cd2450b239a6e6c9dbef2f6ad2c9ba3461e75183133913709b1466066' 
  AND token = 'L/rdu9PPmUKw8SIVf9qqF4ZS8d637IDvscr4cKXno+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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