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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1e50fe6d22b9cb1dff80d7f10554145f8ec13cb51bf2896bacd8756146e2c7' 
  AND token = 'iKOtgl2rcK+v5jJ5FypXVf66DKS8mOY/wYjl9mL4k60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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