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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c349b104c4fe752b994b36221c4e119b68ec87e3f479f2c9664a64236f6664' 
  AND token = 'g8EyHhp5PU2vOqIFAe3liVbYA2SI6cmaayT1Amo2z1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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