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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b2fad0aa5986c635baf6d7cc3c55c802241a3377e6d143fc53157a1f7f8de6' 
  AND token = 'ljQv1D1tPYVrss1FGll6/hYpMkFOXdLTHFk/31A48T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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