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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f6ec3b0aaeb3861ef800786d679bd5d2eb3df937b900e79d13463cd6ea425d' 
  AND token = 'TCGudOCCy3UVHccm59lnDTQrL1/T7hACdBBG+ah7NN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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