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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf96ff1bed52f599e932d85dd63c75bb48abb20aca98f2a3a7f7cbece2ee0b6' 
  AND token = 'kzgTkD/7CI4ZLsAhpALWebTxFHCUZyXmuntjGFqe4Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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