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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6170ea8a98e62390f74d1cd8e635403bd26d2ac69ff9a16c5b503518ae8e0238' 
  AND token = 'j7db3b3ON4TAV+V41tX7hSgVxB6SbxH5vIMC/bRJLZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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