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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9422de8aaedba5fa6360d307c08e71072ee3a06810acac6931a38d38e1a76a4e' 
  AND token = 'TlqSVpClNQdjkR5tz5lF2mVbZRDdKXRly9Trmy5V/qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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