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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac367181c6c6d24f2770b7c68909c613c4537ded5673f8ea1143699bf2a32c6' 
  AND token = 'sFvM/1tQInNDPGxiBk9O/M8uoHFV/FXBwe6vtY86iJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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