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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28eaceace3270b7a9e7cb7c8115e5ed2573cbb16d335d91eecdc3d9d2f9a033' 
  AND token = 'OiTR4rT0F7uSx+/rqkpwC2lcD4+v5HYKnXAEOi/zFok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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