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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be1c05ac947f759b999df82dbc8ef725e076d72ab40bcc61e1e29e80146003c' 
  AND token = 'ODwbTOhC9rUBB0qfSRXfcmwMAhSv82V5JdeQzmTmWtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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