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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912d719e134e26348b46ef3a606ff72fd4ed70eabcf597818bb5768cd4b32445' 
  AND token = 'K20U0W6wew3q9B7B272C0jrjV5o3niE1wOvMjGplWFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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