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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690b64bb280e01aea406f2008627929cbba1c8e2f2355dd3c852bf8ffff41dd3' 
  AND token = 'aOmXUeoyzkfsBA/ViFH80zWNmRP3RuZU5KF3venJgMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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