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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc7da84beeb3976279bcadfcd453ae80bac434b58ecbe3c7cfb2820db566b62' 
  AND token = 'iRcX70SCeU9b2pw7OEthjKtqxyHCW2yRZq7aqHsmINE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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