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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1208070275fbdeee8fda0396dfef78e09d8b4652e8eb10e394bb30421f86583' 
  AND token = 'CmWSVydzIOJvmTgnILlOlpFOwiyDv5RIxlJWW5Xxp28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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