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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47281574bb772381015f2f98d3f444289d2f276e25412c94fd7508f0d36814c9' 
  AND token = 'hv6SWQJAPHjMv2j3kbxatWmS7nEm0ONj+tf/jnMxsIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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