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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccdad1e2a053482feee62b8e0b91e60f3f34313c63bae82600fe3b0a482d930' 
  AND token = 'Wk+xCvvQJ+jWsXVrAO6mkl/nkcplA7eYIORtVTPwaWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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