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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179794c80cd7ac8690f108ed721992f2db3f776a8abbaa43d0ecd4c69a4777b6' 
  AND token = 'AMLOAHg27omh96fq6GQB746dpD12/yRuFVyOy3qPLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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