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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1862e9a12e70b664a81db9239c9357b36c2ef4f6ab5de47c834f1d7a08c6e2' 
  AND token = '/K+SLGwAydeTEyeZkn8YpTFDIqAb1O70eTnElOZxtoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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