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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b18d3adb454dd9526e24c45730c05a76e2ffc14ae3338b96a23564c98815022' 
  AND token = 'bRnzlx+MwY5ZAXf2pTPNV0/Z9NAiqRDcxp6ecdKAKUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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