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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6ee9dcaa654c07d14f8f84ee3e88f50bf2d7370e8c2063807e572fa0c1b6e6' 
  AND token = 'UcX7F0LIf0PkdC5nmvyTB4PRDT9PIMAs7nnTdseygBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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