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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a58b900d54405ad832f05fcefd36c84d5a39215d977d08ede3a3550ddacfe4' 
  AND token = '4Ithb/hyT+Jnf7DxQ4DhpHeHjDUSf8lth3rh2/zzhjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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