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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5504f576d8668739c4b92bef22769ac553ed7dbbd731cb51409026db4217173' 
  AND token = '4EEMI4s1Y0km/s4MkWMPn5Yjzq0+EEWM4AUDqIpFvpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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