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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c377ebac72cc39f2623a6e3ec3980cc8d875ba011b893e238372eedddbd91976' 
  AND token = 't2bNfdofvGraw+k+9DpnEX5Z4XfFDgwDl5Sb3NSBG+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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