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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d80e7482b3c2068ff47ffe800e503c9e8dbbd78425b5835128fbf69d21655b' 
  AND token = '2gM7A+z/tWWpPTthBHj/t1+xgx87bevmCvNUk/JuoSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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