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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dd99b0ba67239ba2c6d0c884b2be749487c49030efd0f0dff8020ff074febe' 
  AND token = 'MoVKANGOZyODEd6gmfr3vOJW4e+yZE1+a4weLOhA+MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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