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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd2fb8775e6b6ea411791f6bbf0bf119a26dbcb5d2d535217b715fa93e3e2e3' 
  AND token = 'sGLM+NY6XeP+qaKTRM+CIkPG9qwSCCK/yPN2m/nXVx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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