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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847ee5babf776580b7b18a08fcf66c136c2bb0c2403d612533ad1630c6c756f7' 
  AND token = 'xu0dZODeq2MiYAAjAvqMVnKos9vHImCYpQOfYHErd1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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