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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29115e91d422abf77c0f7619e647c94ba8fb569e4d57d2b26de5c0676a5a3936' 
  AND token = 'pwQM9ZtzaF4Qif1svFnNuCVfYw2Ylb1OjO2V0VxF3+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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