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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1398fe279039700d906432772120614bf1f24d014165448f699794580d3692bd' 
  AND token = 'pbqitqAtraO5QVn24m/rjzBO5QybfeEVoizF/24Jd5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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