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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9822142ca9a315b61821273dc0721faf7ed14f5d20298c1bbba17bb23906eea5' 
  AND token = 'lKN/38b9bDBhU2dtUsEeTgsBXUUngg92nlK1iJClZ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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