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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d31fb575801b65c503e99ae2fc4c959d13243583904deb8317931cd51936e4e' 
  AND token = '+V7g1f5ZWUiHVi6mUX8OiC9PbiPBI+rFl+YJWP24lO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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