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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba3ebd52d9eeef59ab299706c5882d5ccadaa7c754a271dad77d63a22255cda' 
  AND token = '7QU8ojXunBAVUZ0KxI3HGohYBdSWNUbpx4sMYbrfaIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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