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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aa60a971f2159a12c4b375134eb42465c8bb4fdd68f4d0e56e0ac28332c2fa' 
  AND token = 'qC2iBNlEi2PW/8rVv1nxJQAyzVeUh4eNrm+WhobN3vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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