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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3215c47ff17de302b0d6c794a7beb4f8c63de54d7dc4ba5a07d1f5b8fb98da5' 
  AND token = 'ImKlEEl/0/rEGFfAw6PLVYvoxx8yqYCAMTnDbH9CUwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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