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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5e052ceeb975c51c7613058fbd1d8df3b147f58485fe85d4cf57b930e83238' 
  AND token = 'd6RWB1xGpq7vGmgZIjy4/+cmupYpdPtOPyZocSI90mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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