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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b8c820bbdceb18c44e1aec569292fab7a2237d4335a1822e471974eeed5e8d' 
  AND token = 'ud7JbLF6llwqv5mnpsDN5gDnR6sNv82m/YDz8/kZN8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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