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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548587e9451967ae8924f805c26614b0fdd092e2aff3f2a569eb2dc8e14a5459' 
  AND token = 'gKADBbR4QbPLfceSN5fWBTDFYc877Avbnsc+FQnZ0D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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