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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5576719c8ff510fc3ecccc14a3ff859e7aabed74c55e1855d36811704dda23a6' 
  AND token = '7XaeKEf+spU4z6cIP3bu7kMgyN6g8YwH+0P9UEnHWxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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