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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9777ad45f792637db598c4b673eba6c981ed069c9df940477c4fbbc0b79ef0a0' 
  AND token = 'SLzgsdBoBr1a29cSBC1D0UetaSE1YHXMG/hvkyyOlLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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